2x²-3xy-5y²=0则x除y=
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
已知(x+3)+丨X-y+10丨=0 ,求5x²y-[2x²y-(3xy-xy²)-3x&
已知X/Y=2,则X²+2XY-3Y²/X²-XY+Y²=?
已知2x²-5xy-3y²=0(xy≠0),则y分之x+x分之y的值是?
已知x²-xy-2y²=0,且x、y不等于0,求代数式x²-2xy-5y²除x&
已知x²-3xy+4x=3,y²+xy-4y+7=0,则xy-1/2(x²+y²
1/x+1/y=5,求2x-3xy+2y/x²+xy+y的值
一.x-y=2,则x²-2xy+y²= 二.x-y=-1,xy=3,则x³y-2x
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
已知x的平方=4y平方-4x+4y+5=0,求4次方-y四次方/x+2y乘x-y乘x+2y/xy的平方+y立方除x方+y